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authorChristoph Hellwig <hch@lst.de>2019-07-24 14:02:10 +0200
committerChristoph Hellwig <hch@lst.de>2019-09-11 12:43:22 +0200
commitbef4d2037d2143a4df6430bbe1e970fc7e616f6c (patch)
treeb134cb0723af2dce714a49d57228c9d8f5e11964 /include/xen
parentxen/arm: use dma-noncoherent.h calls for xen-swiotlb cache maintainance (diff)
downloadlinux-dev-bef4d2037d2143a4df6430bbe1e970fc7e616f6c.tar.xz
linux-dev-bef4d2037d2143a4df6430bbe1e970fc7e616f6c.zip
xen/arm: consolidate page-coherent.h
Shared the duplicate arm/arm64 code in include/xen/arm/page-coherent.h. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/arm/page-coherent.h80
1 files changed, 80 insertions, 0 deletions
diff --git a/include/xen/arm/page-coherent.h b/include/xen/arm/page-coherent.h
index 2ca9164a79bf..a840d6949a87 100644
--- a/include/xen/arm/page-coherent.h
+++ b/include/xen/arm/page-coherent.h
@@ -2,6 +2,9 @@
#ifndef _XEN_ARM_PAGE_COHERENT_H
#define _XEN_ARM_PAGE_COHERENT_H
+#include <linux/dma-mapping.h>
+#include <asm/page.h>
+
void __xen_dma_map_page(struct device *hwdev, struct page *page,
dma_addr_t dev_addr, unsigned long offset, size_t size,
enum dma_data_direction dir, unsigned long attrs);
@@ -13,4 +16,81 @@ void __xen_dma_sync_single_for_cpu(struct device *hwdev,
void __xen_dma_sync_single_for_device(struct device *hwdev,
dma_addr_t handle, size_t size, enum dma_data_direction dir);
+static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
+ dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
+{
+ return dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
+}
+
+static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
+ void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
+{
+ dma_direct_free(hwdev, size, cpu_addr, dma_handle, attrs);
+}
+
+static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
+ dma_addr_t handle, size_t size, enum dma_data_direction dir)
+{
+ unsigned long pfn = PFN_DOWN(handle);
+
+ if (pfn_valid(pfn))
+ dma_direct_sync_single_for_cpu(hwdev, handle, size, dir);
+ else
+ __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
+}
+
+static inline void xen_dma_sync_single_for_device(struct device *hwdev,
+ dma_addr_t handle, size_t size, enum dma_data_direction dir)
+{
+ unsigned long pfn = PFN_DOWN(handle);
+ if (pfn_valid(pfn))
+ dma_direct_sync_single_for_device(hwdev, handle, size, dir);
+ else
+ __xen_dma_sync_single_for_device(hwdev, handle, size, dir);
+}
+
+static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
+ dma_addr_t dev_addr, unsigned long offset, size_t size,
+ enum dma_data_direction dir, unsigned long attrs)
+{
+ unsigned long page_pfn = page_to_xen_pfn(page);
+ unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
+ unsigned long compound_pages =
+ (1<<compound_order(page)) * XEN_PFN_PER_PAGE;
+ bool local = (page_pfn <= dev_pfn) &&
+ (dev_pfn - page_pfn < compound_pages);
+
+ /*
+ * Dom0 is mapped 1:1, while the Linux page can span across
+ * multiple Xen pages, it's not possible for it to contain a
+ * mix of local and foreign Xen pages. So if the first xen_pfn
+ * == mfn the page is local otherwise it's a foreign page
+ * grant-mapped in dom0. If the page is local we can safely
+ * call the native dma_ops function, otherwise we call the xen
+ * specific function.
+ */
+ if (local)
+ dma_direct_map_page(hwdev, page, offset, size, dir, attrs);
+ else
+ __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
+}
+
+static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir, unsigned long attrs)
+{
+ unsigned long pfn = PFN_DOWN(handle);
+ /*
+ * Dom0 is mapped 1:1, while the Linux page can be spanned accross
+ * multiple Xen page, it's not possible to have a mix of local and
+ * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
+ * foreign mfn will always return false. If the page is local we can
+ * safely call the native dma_ops function, otherwise we call the xen
+ * specific function.
+ */
+ if (pfn_valid(pfn))
+ dma_direct_unmap_page(hwdev, handle, size, dir, attrs);
+ else
+ __xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
+}
+
#endif /* _XEN_ARM_PAGE_COHERENT_H */